Strut construction



June 2, 1931. A. F. MASIJRY I 1,308,365

STRUT CONSTRUCTION Origin a1 Filed y 1926 2 Sheets-Sheet l June 2, 1931.

F. MASURY I STRUT CONSTRUCTION 2 Sheets-Sheet 2 Oyiginal Filed July 14, 1925' l atentecl June 2, 193i UNITED STATES PATEN 'r 1 OFFICE ALFRED F. MASURY, OF NEW YORK, N. Y., ASSIGNOR TO THE RUBBER SHOCK INSULATOR CORPORATION, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE STRUT CONSTRUCTION Original application filed July 14, 1926, Serial No. 122,528. Divided and this application filed January 6,

1928. Serial The present invention relates to an improved form of strut for mounting a propeller shaft outwardly of the hull of a boat. This portion of the shaft receives severe stresses during the rotation of the propeller, especialy when the latter strikes floating objects or is out of water for a short while due to unusually rough water. Underon dinary operating conditions the propeller shaft is subjected to continual vibration by reason of the unequal reactions on the several propeller blades due to faulty construction and slight irregularities in the pitch and lead thereof.

These vibrations and radial thrusts are transmitted directly to the hull through the struts and an object of this invention is to relieve the hull from these harmful strains. By cushioning the strut mounting, the v1- bration of the shaft is efiectively deadened and there results a construction which provides a strong shaft mounting and at the same time afiords a hull which is free from the objectionable vibrations referred to above.

The present application is a division of the application of Alfred F. Masury, Serial No. 122,528 filed July 14, 1926, for cushioning devices for marine propulsion. As set forth above, the present invention has for an object, the provision of a strut construction which affords a mounting having sufficient strength and at the same time deadens the vibrations set up in the shaft and impressed upon the hull.

Further objects of the invention will ap pear as the description proceeds and reference will now be had to the accompanying drawings wherein:

Figure 1' is a View in elevation, partly in section, showing a preferred form of the present invention.

Figure 2 is a front elevation, partly in section, showing the construction of F igure 1.

The hull of a boat is indicated generally I at a, the planking therefor at a, the ribsat a and the uprights between the ribs to support the deck at (L A suitable block a is provided between certain of the ribs a for mounting a. portion of the yielding nonmetallic means which secures the strut.

Between the block a and the hull, a canvas and white lead seal 00 is provided.

The strut or hanger b, carrying at one end the propeller shaft 0, extends through the hull and block a and is provided with an enlarged end 6. Bolts d secure the base (Z to the ribs adjacent the block a and be tween the block a and the strut b, a non metallic ring e is provided. If desired, a grummet 6 may be provided to seat the cushioning ring 6 within the block a and opening in the hull a.

Within the base (Z, a plate 7 is provided which serves as a seat for the block of yieldmg non-metallic material 9. A cap 05 fits over the block of yielding material 9" and clamps the latter upon the plate f. The compression set up within the block by the clamping of the block (1 upon the plate f may be varied by means of securing bolts 0Z The enlarged end Z) of the strut b is received within a suitably formed recess in the block 9 and when the cap is clamped down upon the latter, the strut is held yieldingly in the desired position. The nonmetallic cushioning ring 6 about the shank of the strut serves as an added strengthening element, as well as an effective seal between the strut and the hull, and the resulting construction affords a mounting which is sufficiently strong to carry the propeller shaft although it is not so rigid as to transmit the objectionable vibrations from such shaft to the hull.

The details of construction and arrangement which have been shown hereinbefore are not to be construed as limiting the invention, the scope of which is defined in the appended claims. v

I claim'as my invention:

for the strut 1. The combination with the hull of a vesing in the hull, yielding non-metallic materlal surrounding and engaging the shank Within the opening to resist gyratory movements, and means to secure the end of the strut within yielding non-metallic material under compression within the hull.

2. The combination with the hull of a Vessel formed with an opening and a propeller shaft, of a strut formed with a bearing for the propeller shaft and an enlarged end, the shank of the strut passing through the opening in the hull, yielding non-metallic matem rial surrounding and engaging the shank within the opening, a metallic housing section secured to the hull and formed with an opening through which the shank of the strut passes, another housing section bolted to the first named housing section and yielding nonmetallic material under compression disposed within the housing and engaging the enlarged end of the strut.

This specification signed this 22d day of December A. D. 1927.

ALFRED F. MASURY. 

